Thermal insert



FIG. 1 is a perspective view of a thermal insert showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a side elevation view thereof, and which is taken from a position opposite to that which is seen in FIG. 2;

FIG. 4 is a side elevation view thereof, and which is taken from a position approximately 90 degrees offset from that seen in FIG. 2;

FIG. 5 is a side elevation view thereof, and which is taken from a position opposite to that seen in FIG. 4;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof. 

CLAIM The ornamental design for a thermal insert, as shown and described. 